Four people suffered burn injuries in a fire following an air compressor explosion in Rupganj of Narayanganj on Monday night, with one of them in critical condition.
The incident occurred around 8pm, and the injured were later admitted to the National Institute of Burn and Plastic Surgery in Dhaka.
Dr Sultan Mahmud Sikder, resident surgeon at the institute's emergency department, said Naimul, 30, suffered burns to 42 percent of his body, while Ismail, 30, sustained 20 percent burns.
Kamrul, 55, suffered burns to 25 percent of his body, and Tapan, 38, sustained 12 percent burns.
Naimul also suffered injuries from inhaling smoke, while the other three are suspected to have similar injuries.
All four have been admitted to the institute and are receiving necessary treatment, but Naimul's condition is critical, the doctor added.